what are the characteristic of norepinephrine? precursor? what is the main route of re-uptake etc? what role do alpha adrenorepectors play?

precursor - tyrosine!! also dopamine involved. once made it is stored in nerve terminals until an action potential come along nerve. it undergoes mainly re-uptake but also enzymatic degratation. alpha and beta adrenoreceptors.

alpha 2 adrenoreceptor - negative feedback on nerve terminal!!

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explain the re-uptake of norepinephrine? 2 enzymes? which more important?